Yesterday I test flew the Mongoose with the Futaba GV-1 governor in place and experienced similar problems to the CSM Revlock.

After disconnecting the Governor,  the problem still existed and turned out to be engine tuning related and after a few adjustment I got the engine dialed in and re-activated the GV-1 which performed fine.

 My next test is to re-install the CSM Revlock and see if it now works.

 Stay tuned!